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- (No Model.) 2 SheetsSheet 1.

R. LUNDELL. ARMAIURE FOR ELECTRIC MOTORS OR DYNAMOS. No. 461,795.Patented Oct. 20,1891.

. Q1 iro gnaw M (N0 Modl.) 2 Sheets-Sheet 2.

R. LUNDELL. Alt-MATURE .FOR ELECTRIC MOTORS 0R DYNAMOS. 110.461,?95.Patented Oct. 20, 1891.

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UNITED STATES PATENT OFFICE.

ROBERT LUNDELII, OF NEW YORK, N. Y., ASSIGNOR OF ONEJIALF 'lO EDWVARD H.JOHNSON, OF SAME PLACE.

ARMATURE FOR ELECTRIC MOTORS OR DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 461,795, dated October20, 1891.

Serial No. 387,605. (No model.)

To all whom it may concern.-

Be it known that I, ROBERT LUNDELL, a citizen of the United States,residing at New York city, in the county and State of New York, haveinvented a certain new and useful Improvement in Armatures for ElectricMotors or Dynamos, (Case B,) of which the following is a specification.

The present invention relates to improvements inthe cores of armaturerings or cylinders and to means for securing said cores to thearmature-shaft.

The object of the invention is to so form the armature thatit shall haveincreased efficiency, shall be easy to manufacture, and to providereadymeans for rigidly supporting the armature on the shaft; and theinvention consists in the several features and combinations hereinafterdescribed and claimed.

In the accompanying drawings, illustrating the improvements, Figure 1 isa side view of the armature-core, a portion being broken away at thelower side and showing, also, means for supporting the armature. Fig. 2is a central section of the same armature. Figs. 3 and 4 are similarviews of a modified form, and Figs. 5 and 6 views showing an additionalmodification.

The main body of the armature ring or cylinder is built up ofsheet-metal rings or washers 1, which may or may not be separated bypaper or other insulating materials. These washers are stamped fromsheet-metal plates and are formed with teeth or projections 2 3 on theinner and outer faces. hen the washers are put together to build up thering or cylinder, these projections are put in line with each other, soas to leave grooves 4 extending entirely across the ring and in whichthe armature-coils are to be wound. Said coils are omitted in thedrawings to avoid unnecessary complications. In some cases theprojections on one or both faces of the ring may be omitted. I find itpreferable to build up the ring of short plates in the form of arcs andhaving teeth 2 3, instead of using washers in the form of rings, asabove described. Several arc-shaped plates are arranged in a circle, andother plates similarly arranged are placed above the first series, theplatesin one circle breaking joints with those in the adjacent circleandall being secured together by soft-iron rods 5, surrounded by paper 6.In Fig. 1 each layer is composed of four pieces and twelve bolts 5 areen'lployed. If an u neven number of divisions or coils is desired in thearmaturefor example, twentysevenwhen the armature is to be used with afour-pole field, instead of building up the different layers in the coreof four pieces, as shown in Fig. 1, an uneven number of pieces, asthree, may be used,each piece having an uneven number of teeth, saynine. In this case the numberof bolts 5 employed would be nine. Thebolts are arranged at regular intervals around the core, and this willcause some of them to come in line with the grooves in which thearmature-coils are wound; butsince the bolt-heads do not project thecoils do not have to be bent around them, but can be wound regularly asthough the bolts were absent. At either end of the ring is placed athicker strengthening-ring 7, which is provided with recesses, in whichare placed hard-metal washers or collars 8, into which the rods 5 lit.The ends of said rods arethen riveted, whereby the lalninations of thearmature are securely held together. This means for securing the partsis found to be better than ordinary bolts with nuts, since the collars 8can be much thinner than a nut of necessary strength and can be sunkinto the ring 7. The mass of metal where the rods are secured to therings is thus reduced to the minimum, and there are no projections inthe way of a regular winding of the armature-coil on the core. After thearmature is thus built up it is put in a lathe and the outer and innerfaces are turned to make them true, if necessary. The bevels on theinner face of the ring, hereinafter described in connection with Fig. 4,are also formed at this stage of the manufacture.

The means for supporting the armature on the motor-shaft will now bedescribed.

9 is a sleeve or hub adapted to be rigidly connected to the motor-shaftby means of a spline or otherwise. This sleeve has beveled faces 10 atboth ends. Between the sleeve and the inner face of the armature-ring ateach end is a spider, made in several pieces, as shown in Fig. 1, or inone piece, as shown In Fig. 1 the spider is formed of in Fig. 3.

four pieces 11. The outer face 12 of each of these pieces is curved andis provided with a series of grooves 13, adapted to receive the inneredges of the teeth 3. The inner face 1% is also curved, as shown in Fig.1, and is inclined, as shown in Fig. 2, to correspond in shape to theend of sleeve 9. Extending parallel with the shaft of the armaturebetween each pair of pieces 11 is a bolt 15, having nuts 16, by means ofwhich the sections of the spider may be drawn toward each other andtightly wedged between the teeth 3 and the sleeve 9.

17 are splines between the spider and the hub 9.

In Figs. 3 and 4c the parts are designated, so far as practicable, as inFigs. 1 and 2. In the former figures, however, the spiders 11 are madein a single ring-shaped piece, the outer face 18 being beveled orinclined to correspond to a similar bevel or incline 19 on the innerface of the projections 3 of the armature-ring. Instead of using a hub9, I form hubs E) at the center-of each spider. These are adapted to berigidly connected with the motor-shaft. On the heads of the rods 5 areplaced conical collars 8, instead of the form shown in Fig. 2, saidheads being upset or riveted, as already described.

Figs. 5 and 6 illustrate another modification. The spiders ll'haveseveral arms, the outer ends of which are grooved and beveled, as shownin Figs. 5 and 6, respectively. At the outer ends of the arms are keys20, hav ing beveled faces 21 and having grooves 22 adapted to receivethe inner teeth 3 of the armature, so that when the two spiders areforced toward each other the spiders and armature will be rigidlyconnected.

It will be seen that the spiders in all the forms described are entirelywithin the circle formed by the inner ends of the teeth 3, so that thespiders do not interfere with the regular winding of the ring orcylinder.

hat I claim is- 1. The combination of an armature ring or cylinderhaving projections on its inner face, a shaft, and a spider or supportbetween the shaft and the armature, the face bearing against saidprojections on the armature having grooves in which the projectionsrest, substantially as described.

2. The combination of an armature ring or cylinder having projections onits inner face, a shaft, a spider or support between the shaft andarmature, said spider having grooves in which said projections bear, andmeans for wedging the parts together, substantially as described.

The combination of an armature ring or cylinder having projections onits inner face, a shaft, a spider or support between the shaft and thearmature, and a key between the spider and armature, the face of the keybearing against said projections on the armature and having grooves inwhich the projections rest, substantially as described.

4.. The combination of an armature ring or cylinder having projectionson its inner face, two spiders having curved outer faces coni'orming tothe inner face of the ring and beveled and grooved, and means fordrawing the spiders toward each other, substantially as described.

This specification signed and witnessed this 28th day of March, 1891.

ROHT. LUNDELI).

Witnesses:

CHARLES M. CATLIN, AUGS. IIAVILAND.

